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Contents of PROCEEDINGS, No. A 532. August, 1907. 



Price 3s. 



Page 



ON THE DYNAMICAL THEORY OF GRATINGS. By Lord Rayleigh, O.M., 



Pres. R.S 399 



ON THE VELOCITY OF ROTATION OF THE ELECTRIC DISCHARGE IN 



GASES AT LOW PRESSURES IN A RADIAL MAGNETIC FIELD. By Professor H. A. Wilson, 

 F.R.S., and G. H. Martyn, B.Sc, Wheatstone Laboratory, King's College, London .. 417 



ON A STANDARD OF MUTUAL INDUCTANCE. By Albert Campbell, B.A. 428 

 ON THE ORIGIN OF THE GASES EVOLVED BY MINERAL SPRINGS. 



By the Hon. R. J. Strutt, F.R.S 436 



PRELIMINARY NOTE ON A NEW METHOD OF MEASURING DIRECTLY 



THE DOUBLE-REFRACTION IN STRAINED GLASS. By L. N. G. Filon, M.A., D.Sc, Fellow 



and Lecturer of University College, London . . . . . . . . . . . . . . . . . . . . . . 440 



ON THE VELOCITY OF THE CATHODE PARTICLES EMITTED BY 



VARIOUS METALS UNDER THE INFLUENCE OF RONTGEN RAYS, AND ITS BEARING 

 ON THE THEORY OF ATOMIC DISINTEGRATION. By P. D. Innes, M.A., B.Sc, 1851 

 Exhibition Scholar of the University of Edinburgh ; Trinity College, Cambridge . . . . . . . . . . 442 



THE HARD AND SOFT STATES IN DUCTILE METALS. By G. T. Beilby, 



F.R.S 463 



SOLD BY HARRISON & SONS, 45, ST. MARTIN'S LANE, W.C. 



